HCSO held a press conference titled „Preliminary data of the population census 2011” on 27 March 2012. The Hungarian Central Statistical Office conducted the 15th census of Hungary in October 2011. Nearly 40 thousand enumerators visited about 4.4 million dwellings in order to collect data on the social, demographic and economic characteristics as well as on the housing conditions of the population in Hungary. Processing and publishing census data is a process of several years. Our present publication shows the changes in the population number and in the most important data of the dwelling stock.